projectexplorer: move project{Context,Language} from IProjectManager to Project

Reviewed-by: dt

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -99,6 +99,9 @@ CMakeProject::CMakeProject(CMakeManager *manager, const QString &fileName)
       m_rootNode(new CMakeProjectNode(m_fileName)),
       m_lastEditor(0)
 {
+    setProjectContext(Core::Context(CMakeProjectManager::Constants::PROJECTCONTEXT));
+    setProjectLanguage(Core::Context(ProjectExplorer::Constants::LANG_CXX));
+
     m_file = new CMakeFile(this, fileName);
 
     connect(this, SIGNAL(addedTarget(ProjectExplorer::Target*)),